1885.] PROCEEDINGS OF UNITED S'i'ATE8 NATIONAL MUSEUM. GOT 



numbers 2311 to 2420, inclusive) were made, in deptbs of 21 to 1,4G7 

 fathoms, tbe deepest series, rauging from 730 to 1,467 fathoms, being 

 located directly south of Mobile. On the return trip several lines of 

 serial temperatures were carried ont from the capes of Virginia across 

 the area in which the schools of mackerel and menhaden first api)ear 

 at the beginning of their spring migrations toward the north; and it 

 is believed that a continuance of these observations through several 

 years will afford some clue to the changes observed in the movements 

 of these fish from year to year. An account of the i^ractical results 

 obtained on this cruise will soon be published. 



Lieut.-Commander Z. L. Tanner, U. S. N., was in command of the 

 expedition, with Capt. J. W. Collins in charge of the i^ractical fishery 

 investigations, and Mr. James E. Benedict chief naturalist, assisted 

 by Mr. Willard Nye, jr., and Mr. Thomas Lee. Dr. T. H. Bean, curator 

 of the department of fishes in the National Museum, also accompanied 

 the steamer during the first half of the cruise, and Mr. Silas Stearns, 

 of Pensacola, Fla., made two trips to the red-snapper grounds. 



Of the group of .Echini, or sea urchins, 31 species were collected in 

 suitable condition for determination, being 8 more than were obtained 

 in the same region the previous winter. These represent 78 dredging 

 stations, with depths of 21 to 1,330 fathoms, only one species having 

 been obtained in shore collecting, viz., at the island of Cozumel. Seven- 

 teen species were additional to tliose collected in 1884, and 9 of the 

 species collected in 1884 were not obtained in 1885. The total number 

 of species obtained on these two cruises was 40. I am indebted to Mr. 

 Alexander Agassiz for assistance in making some of the identifications. 

 The numbers in parentheses refer to the Radiate catalogue of the U. S. 

 National Museum. 



List of the stations at which Echini were collected in 1885. 

 OFF SOUTH CAEOLLRA. 



OFF KEY WEST, FLA. 



